eased from this position, determine the spri ormal acceleration of the rod center of mas ough a vertical position.
eased from this position, determine the spri ormal acceleration of the rod center of mas ough a vertical position.
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Transcribed Image Text:A 400-lb slender rod pivots about the point O. The other end is pressed against a
spring until the spring is compressed 3 inches and the rod is in a horizontal position.
If the rod is released from this position, determine the spring stiffness, k, (in Ib/inch)
for which the normal acceleration of the rod center of mass is 27.09 ft/s^2, as the
rod passes through a vertical position.
Notice that, the length of the rod, AB, is 9 ft and OB is 2 ft (as shown in the
following image).
Assume that:
x-axis to the right is positive
y-axis upward is positive
Moment, M, clockwise is positive
9 ft
a 2 ft
A
B
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